The 13th International Conference on Liquid Atomization and Spray System-ICLASS 2015 will be held at National Cheng Kung University (NCKU), Tainan, Taiwan, from August 24 to 27. A total of more than 250 papers will be presented in this conference. ICLASS International gathers members every three years from the Asian, American, and European regional sections for the mutual exchange of scientific and technical information and the promotion of membership in each ILASS body. The focus of this triennial conference is interdisciplinary and covers many topics related to theory and modeling, experimental observation and instrumentation, design, and operation and applications in the fields of atomization and spray systems. Professor Chung K. Law, Professor Joël De Coninck, Doctor William D. Bachalo, and Professor Min Xu, from the countries of the United States of America, Belgium, and China, are invited to give plenary speeches.